A numerical model of the THD behaviour of an aligned face seal in transient regime was developed in order to study the viscous heat dissipation in the interface and the thermal transfers with the seal environment during start-up. The Reynolds equation and the energy equation in the interfacial film and the conduction equation in the seaj rings are solved numerically by the finite difference technique. These equations are coupled by the heat exchange conditions on the boundaries of their domains. They are integrated by using the Crank Nicholson scheme. This study also compares the results of the calculation code and those of existing 1D models. Good correlation is found and some simplifying assumptions are validated. The results show the presence of a peak of the dissipated power just after start-up. The transient evolution of the temperature field in the seal is described and the influence of dissipation and heat transfer parameters is examined.
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